[Bug c++/91423] address-of-packed-member when taking packed struct member by value

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91423

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Other than that, when GCC elides a copy from by value passing it would need to
create a temporary that is appropriately aligned.  IIRC packed is outside of
the C++ standard and using packed objects with C++ features might result in
surprising standard interactions.